Permanent tint 100ml + 100ml 20vol developer 0.45 is red based additive which can be used a stand alone tint on pre bleached/ light colored hair ( level 7-10) 0.45 cannot correct uneven colors. A base shade should be used with 50% 0.45 to correct uneven shades, Such as a 5.66 or 7.66 etc. On darker hair, it will give a red/maroon tone. Lifts up to 2-3 levels on fine hair types, and 1-2 levels on resistant hair. ** Please note, hair dye does not lift hair dyes, henna etc. Do not apply normal hair dye over henna dye, this will case a metallic reaction** **0.45 Cannot make black, dark brown hair into fire red at all. You need to first bleach to a level 7 or lighter, then tint the hair.** Always take in consideration underline coloration for formulating your mixture. Processing time is 20-40mins. 20 mins for depositing, 40mins for lifting. for full grey coverage over 50% natural grey hair, a normal level tint must be used ( such as a 7N or 6N etc) Check color development every 5-10 mins ** Please note, hair dye does not lift hair dyes. So if you have dark spots from previous dye, it must be removed first** Mixing ratio should be 1-1 on full depositing. Test strand should be done to determent mixing ratio should you need more lift.